Bug 1381983 - [2.1] Add default/stub implementations of the context menu handlers. r=snorp

mobile/android/base/java/org/mozilla/gecko/BrowserApp.java

@@ -3456,6 +3456,10 @@ public class BrowserApp extends GeckoApp
         }
     }
 
+    @Override
+    public void onContextMenu(GeckoView view, int screenX, int screenY,
+                              String uri, String imageSrc) {}
+
     @Override
     public boolean onPrepareOptionsMenu(Menu aMenu) {
         if (aMenu == null)

mobile/android/base/java/org/mozilla/gecko/customtabs/CustomTabsActivity.java

@@ -567,4 +567,8 @@ public class CustomTabsActivity extends AppCompatActivity
 
     @Override
     public void onFullScreen(GeckoView view, boolean fullScreen) {}
+
+    @Override
+    public void onContextMenu(GeckoView view, int screenX, int screenY,
+                              String uri, String imageSrc) {}
 }

mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/GeckoViewActivity.java

@@ -133,6 +133,14 @@ public class GeckoViewActivity extends Activity {
                 getActionBar().show();
             }
         }
+
+        @Override
+        public void onContextMenu(GeckoView view, int screenX, int screenY,
+                                  String uri, String imageSrc) {
+            Log.d(LOGTAG, "onContextMenu screenX=" + screenX +
+                          " screenY=" + screenY + " uri=" + uri +
+                          " imageSrc=" + imageSrc);
+        }
     }
 
     private class MyGeckoViewProgress implements GeckoView.ProgressListener {